lightning: Add and to InitContext and NodeContext.

Author: Aditya Sharma

lightning/src/ln/channelmanager.rs

@@ -9605,6 +9605,8 @@ pub fn provided_init_features(config: &UserConfig) -> InitFeatures {
 	features.set_scid_privacy_optional();
 	features.set_zero_conf_optional();
 	features.set_route_blinding_optional();
+	features.set_want_peer_backup_storage_optional();
+	features.set_provide_peer_backup_storage_optional();
 	if config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx {
 		features.set_anchors_zero_fee_htlc_tx_optional();
 	}

lightning/src/ln/features.rs

@@ -66,6 +66,10 @@
 //!      for more info).
 //! - `Keysend` - send funds to a node without an invoice
 //!     (see the [`Keysend` feature assignment proposal](https://github.com/lightning/bolts/issues/605#issuecomment-606679798) for more information).
+//! - `want_peer_backup_storage` - Indicates that the node desires peers that offer peer storage
+//!		(see https://github.com/lightning/bolts/pull/1110 for more info).
+//! - `provide_peer_backup_storage` - Indicates that we offer the capability to store data of our peers
+//! 	(see https://github.com/lightning/bolts/pull/1110 for more info).
 //!
 //! LDK knows about the following features, but does not support them:
 //! - `AnchorsNonzeroFeeHtlcTx` - the initial version of anchor outputs, which was later found to be
@@ -149,7 +153,7 @@ mod sealed {
 		// Byte 4
 		OnionMessages,
 		// Byte 5
-		ChannelType | SCIDPrivacy,
+		WantPeerBackupStorage | ProvidePeerBackupStorage | ChannelType | SCIDPrivacy,
 		// Byte 6
 		ZeroConf,
 	]);
@@ -165,7 +169,7 @@ mod sealed {
 		// Byte 4
 		OnionMessages,
 		// Byte 5
-		ChannelType | SCIDPrivacy,
+		WantPeerBackupStorage | ProvidePeerBackupStorage | ChannelType | SCIDPrivacy,
 		// Byte 6
 		ZeroConf | Keysend,
 	]);
@@ -405,6 +409,12 @@ mod sealed {
 	define_feature!(39, OnionMessages, [InitContext, NodeContext],
 		"Feature flags for `option_onion_messages`.", set_onion_messages_optional,
 		set_onion_messages_required, supports_onion_messages, requires_onion_messages);
+	define_feature!(41, WantPeerBackupStorage, [InitContext, NodeContext],
+		"Feature flags for `want_peer_backup_storage`.", set_want_peer_backup_storage_optional,
+		set_want_peer_backup_storage_required, supports_want_peer_storage, requires_want_peer_storage);
+	define_feature!(43, ProvidePeerBackupStorage, [InitContext, NodeContext],
+		"Feature flags for `provide_peer_backup_storage`.", set_provide_peer_backup_storage_optional,
+		set_provide_peer_backup_storage_required, supports_provide_peer_storage, requires_provide_peer_storage);
 	define_feature!(45, ChannelType, [InitContext, NodeContext],
 		"Feature flags for `option_channel_type`.", set_channel_type_optional,
 		set_channel_type_required, supports_channel_type, requires_channel_type);
@@ -1034,6 +1044,22 @@ mod tests {
 		assert!(!features1.requires_unknown_bits_from(&features2));
 		assert!(!features2.requires_unknown_bits_from(&features1));
 
+		features1.set_want_peer_backup_storage_required();
+		assert!(features1.requires_unknown_bits_from(&features2));
+		assert!(!features2.requires_unknown_bits_from(&features1));
+
+		features2.set_want_peer_backup_storage_optional();
+		assert!(!features1.requires_unknown_bits_from(&features2));
+		assert!(!features2.requires_unknown_bits_from(&features1));
+
+		features1.set_provide_peer_backup_storage_required();
+		assert!(features1.requires_unknown_bits_from(&features2));
+		assert!(!features2.requires_unknown_bits_from(&features1));
+
+		features2.set_provide_peer_backup_storage_optional();
+		assert!(!features1.requires_unknown_bits_from(&features2));
+		assert!(!features2.requires_unknown_bits_from(&features1));
+
 		features1.set_data_loss_protect_required();
 		assert!(features1.requires_unknown_bits_from(&features2));
 		assert!(!features2.requires_unknown_bits_from(&features1));